<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Playground</title>
<meta name="description" content="" />
<meta name="keywords" content="" />
<meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<meta name="format-detection" content="telephone=no" />
<meta name="apple-mobile-web-app-status-bar-style" content="black" />
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-touch-fullscreen" content="yes" />
<!-- <link rel="stylesheet" type="text/css" href="css/main.css" /> -->
</head>

<body>
<style>
.playground {
    position: relative;
    width: 900px;
    height: 500px;
    margin: 0 auto;
    background: #ff6633;
    border-radius: 250px;
}
.playground .inner {
    position: absolute;
    left: 100px;
    top: 100px;
    width: 700px;
    height: 300px;
    margin: 0;
    background: #fff;
    border-radius: 150px;
}
.playground .category {
    display: none;
    list-style: none;
    float: right;
    width: 200px;
    padding: 0;
    margin: 0;
    font-size: 12px;
    color: #fff;
    background: #ff6633;
}
.playground .category li {
    height: 15px;
    padding: 5px;
    margin: 0;
    line-height: 15px;
    border-bottom: solid 1px #fff;
}
</style>
<div class="playground" id="playground">
    <div class="inner"></div>
    <ul class="category">
        <li>跑步</li>
        <li>快走</li>
        <li>骑车</li>
        <li>游泳</li>
        <li>力量</li>
        <li>跳操</li>
        <li>瑜伽</li>
        <li>太极</li>
    </ul>
</div>
</body>
</html>